8522137421 has 16 divisors (see below), whose sum is σ = 9805694976. Its totient is φ = 7255178736.

The previous prime is 8522137391. The next prime is 8522137433. The reversal of 8522137421 is 1247312258.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8522137421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8522137441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2157170 + ... + 2161116.

It is an arithmetic number, because the mean of its divisors is an integer number (612855936).

Almost surely, 2^8522137421 is an apocalyptic number.

It is an amenable number.

8522137421 is a deficient number, since it is larger than the sum of its proper divisors (1283557555).

8522137421 is a wasteful number, since it uses less digits than its factorization.

8522137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968.

The product of its digits is 26880, while the sum is 35.

The square root of 8522137421 is about 92315.4235271658. The cubic root of 8522137421 is about 2042.5977272017.

Adding to 8522137421 its reverse (1247312258), we get a palindrome (9769449679).

The spelling of 8522137421 in words is "eight billion, five hundred twenty-two million, one hundred thirty-seven thousand, four hundred twenty-one".